Communication device using a waveguide converter - unguided tube line and waveguide converter - unguided tube line

摘要

PROBLEM TO BE SOLVED: To achieve size and cost reduction even when a filter is inserted into a waveguide circuit side, to sufficiently suppress an unwanted signal, and to attenuate even harmonics in a wide frequency band.;SOLUTION: A converter comprises: a second waveguide 10B provided with a short-circuit plane S; a probe 14 inserted into a waveguide 10 from an H plane thereof at a tip of a microwave strip line 13 formed on a dielectric substrate 12; and a columnar conductor 16 which is arranged while projecting from a short-circuit plane S to nearby the probe 14, and adapted to form a resonance circuit resonating to a predetermined frequency. The waveguide 10 (10A and 10B) has a width of a rectangle in a magnetic field direction set to a value such that the circumference of a reception frequency band is equal to or less than a cutoff frequency of the waveguide, and the probe 14 is provided with an open stub. Further, a waveguide step impedance converter is provided between the waveguide of the converter and a transmitter-side waveguide.;COPYRIGHT: (C)2012,JPO&INPIT